@ezraswife , from your post I am not sure :
(a) you are a US person
(b) that your tax home is in USA i.e. you live and work in the US
(c) if the foreign employer has a IUS base
Generally, if you a US person ( citizen/ GreenCard ) working in the USA for a foreign employer ( with NO local; office/ presence ), you show your income on Schedule-C --- sole proprietor/ contractor/ consultant self-employed -- you are liable for Federal / State and FICA-SECA taxes.
If you are abroad ( US person as defined above ) again you enter your incomes just as if you are a self-employed and utilizing the schedule-C and schedule-SE ( as above ). Whether you have multiple employers or you move from country to country ( and with different employers or otherwise ), you still follow the same procedure.
Granted , my response is kind of general but unless you provide more specifics ( your immigration status, whether your tax home is US or foreign etc. ) I cannot be more specific. If your case is one that is not of general interest , then you are quite welcome to send me details of your situation and/or questions via PM ( please no personally identifiable info ).
pk
